KR100962087B1 - Quality-test equipment of Automobile Fuel Pump - Google Patents

Abstract

The present invention relates to an apparatus for testing a characteristic of a fuel pump for an automobile, and more particularly, a liquid fuel is discharged by a fuel pump under high pressure according to a temperature condition inside a warmer, the flow rate thereof is measured, and the pressure is reduced to an appropriate pressure. By repeating the recovery process, there is a characteristic that the operating characteristics of the fuel pump can be stably evaluated in various situations (for example, according to the external temperature and pressure of the fuel pump).

As described above, the present invention is a device for testing the operating characteristics of the fuel pump for each temperature according to the pressurized conditions,

A thermostat for selectively controlling the internal temperature;

A bombe installed inside the thermostat and storing the fuel in a liquid state to install the fuel pump therein to pressurize a pressure suitable for a condition;

A fuel pump installed inside the bombe to pressurize the fuel above the saturated steam pressure and pump the fuel outward;

A fuel pump driving device connected to the fuel pump and installed at one end of the thermostat to measure the driving of the fuel pump, the voltage / current change and the rotation speed;

And a controller configured to receive data collected from the fuel pump driving device, the thermostat, and the bomb by an electrical signal, and to analyze the collected data to control each device based on data input by a user. Characterized in that the configuration.

Fuel Pump, LPG, Bomb, Characteristics, Thermostat, Regulator

Description

Quality-test equipment of Automobile Fuel Pump

The present invention relates to an apparatus for testing a characteristic of a fuel pump for an automobile, and more particularly, a liquid fuel is discharged by a fuel pump under high pressure according to a temperature condition inside a warmer, the flow rate thereof is measured, and the pressure is reduced to an appropriate pressure. By repeating the recovery process, the present invention relates to an automotive fuel pump characteristic test apparatus capable of stably evaluating the operating characteristics of a fuel pump under various circumstances (for example, according to the external temperature and pressure of the fuel pump).

Recently, as particulates emitted from large commercial diesel vehicles such as trucks and buses, and harmful emissions such as nitrogen oxides are recognized as major environmental pollution sources in large cities, various environmentally friendly alternative fuel engines are being sought.

LPG (Liquefied Petroleum Gas) LPG (Liquefied Petroleum Gas) fuel is attracting the most attention in terms of safety and economics as well as low pollution, and the fuel supply technology related to such LPG fuel is the first-generation simple mixer and the second-generation feedback mixer. It is being developed and is currently being converted to the third generation gas or liquid port injection method.

In particular, LPLi (Liquid Phase LPG injection) system adopts the method of injecting LPG fuel into the liquid phase.Injection volume efficiency and output increase and exhaust gas temperature are reduced due to the reduction of the intake air temperature by the latent heat of vaporization of liquid LPG fuel during the injection. It has advantages such as reduction and knocking reduction.

In the LPG vehicle equipped with the LPLi system, the LPG fuel must be maintained in the liquid phase while being transported along the fuel supply line to the combustion chamber so that the liquid injection is performed. For this purpose, LPG fuel is required for the liquefaction of the LPG using a high pressure fuel pump and a pressure regulator. The pressure is supplied above the pressure.

However, in order to measure the performance of the fuel injector installed in the LPLi system, it is necessary to supply / recover the LPG fuel in the liquid phase until it is injected from the fuel injector. There is a problem that the experimental system cannot perform this function.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems,

According to the temperature conditions inside the warmer, the liquid fuel is discharged by the fuel pump at high pressure, the flow rate is measured, and the pressure is reduced and recovered at an appropriate pressure. It is an object of the present invention to provide a test apparatus for the characteristics of a fuel pump for an automobile capable of stably evaluating the operating characteristics of the fuel pump under external temperature and pressure.

In order to achieve the above object, the present invention provides a device for testing the operating characteristics of the fuel pump for each temperature according to the pressurized conditions,

A thermostat for selectively controlling the internal temperature;

Is installed inside the thermostat, the fuel pump is installed inside to store the fuel in a liquid state to pressurize the pressure according to the conditions, the second pressure / temperature sensor for measuring the pressure and temperature inside is installed at one end Being a bombe;
A pressure supply device connected to the cylinder 20 and installed outside the thermostat 10 to pressurize a pressure suitable for a condition therein;

A supply pipe P1 is connected to one end of the cylinder to be pumped to the outside by pressurizing the fuel to a saturated steam pressure or higher, and return pipe P2 connected to the supply pipe P1 to return the transferred fuel again. ) Is connected to the other end, the return pipe (P2) is a fuel pump having a first pressure / temperature sensor for measuring the pressure and temperature of the fuel transported therein and a flow meter for measuring the flow rate of the fuel transported therein Wow;

A fuel pump driving device connected to the fuel pump and installed at one end of the thermostat to control on / off of the fuel pump and to measure voltage / current change and rotational speed of the fuel pump;

The voltage / current change and the rotation speed of the fuel pump driving device, the temperature of the thermostat and the pressure / temperature of the bomb are received and collected by an electrical signal, and the data input by the user by analyzing the collected data And a controller formed outside of the thermostat to control the thermostat, the bomb and the fuel pump, and the fuel pump driving apparatus.

As described above, the characteristic test apparatus of the automotive fuel pump of the present invention is to send the liquid fuel in the high pressure state by the fuel pump in accordance with the temperature conditions inside the thermostat, measure the flow rate and then decompress the pressure By repeating the recovery process, there is an effect that the operating characteristics of the fuel pump can be stably evaluated in various situations (for example, according to the external temperature and pressure of the fuel pump).

The present invention has the following features to achieve the above object.

The present invention is a device for testing the operating characteristics of the fuel pump for each vehicle according to the pressurized conditions,

A thermostat for selectively controlling the internal temperature;

Is installed inside the thermostat, the fuel pump is installed inside to store the fuel in a liquid state to pressurize the pressure according to the conditions, the second pressure / temperature sensor for measuring the pressure and temperature inside is installed at one end Being a bombe;
A pressure supply device connected to the cylinder 20 and installed outside the thermostat 10 to pressurize a pressure suitable for a condition therein;

A supply pipe P1 is connected to one end of the cylinder to be pumped to the outside by pressurizing the fuel to a saturated steam pressure or higher, and return pipe P2 connected to the supply pipe P1 to return the transferred fuel again. ) Is connected to the other end, the return pipe (P2) is a fuel pump having a first pressure / temperature sensor for measuring the pressure and temperature of the fuel transported therein and a flow meter for measuring the flow rate of the fuel transported therein Wow;

A fuel pump driving device connected to the fuel pump and installed at one end of the thermostat to control on / off of the fuel pump and to measure voltage / current change and rotational speed of the fuel pump;

The voltage / current change and the rotation speed of the fuel pump driving device, the temperature of the thermostat and the pressure / temperature of the bomb are received and collected by an electrical signal, and the data input by the user by analyzing the collected data And a controller formed outside the thermostat to control the thermostat and the bomber and the fuel pump and the fuel pump driving apparatus.

In addition, the controller of the present invention includes a power supply for supplying a stable power for driving each device;

A data acquisition device (DAQ, data acquisition) which collects the data transmitted from each device, compares the data inputted by the user, and sends a signal;

And a fuel pump controller for controlling the fuel pump according to a signal sent from the data acquisition device DAQ.

In addition, the fuel pump driving apparatus of the present invention, the driver electrically connected to the fuel pump control device of the controller for controlling the driving of the fuel pump in response to the signal of the fuel pump control device (driver);

A rotation sensing unit (RPM sensing) measuring the revolution per minute (RPM) of the driver through the driving unit and transferring data to a data collection device of an external controller;

 And a voltage / current measuring unit measuring the voltage and ampere of the fuel pump to transfer data to a data collection device of a controller installed outside.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a schematic view showing a fuel pump characteristic test apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the characteristic test apparatus for an automotive fuel pump of the present invention is an apparatus for testing operating characteristics for each temperature of an automotive fuel pump 30 according to pressurization conditions, and includes a thermostat 10 and a cylinder ( a bombe 20, a fuel pump 30, a fuel pump drive device 40, and a controller 50. At this time, the fuel pump 30 is a pump in which LPG, DME or the like is used as fuel.

The thermostat 10 may selectively adjust the internal temperature according to the signal of the controller 50, the internal temperature may be set to -40 ~ 80 ℃, 10 for the characteristic test of the fuel pump 30 Intervals are taken at ° C / min and time is tested at 10-20 minute intervals.

The cylinder 20 is installed in the thermostat 10, the fuel 20 is stored in the liquid state in the liquid state to maintain the pressure (approximately 2 atm) to meet the test conditions, slightly depending on the temperature There is a pressure fluctuation of.

At this time, the fuel pump 30 is installed inside the bomb 20 to test the characteristics of the fuel pump 30 through repeated fuel circulation for each temperature.

Here, the cylinder 20 is installed with a second pressure / temperature sensor 21 for measuring the pressure and temperature inside and transmitting a signal to the controller installed outside, through the second pressure / temperature sensor 21 The measured data signal is transmitted to the controller 50 to operate in accordance with the data signal input to the controller 50.

In addition, the bomb 20 is provided with a separate pressure supply device (such as a compressor, etc.) to the outside to press the pressure according to the conditions therein is connected through a mutual pipe.

The fuel pump 30 may be used for a test of a built-in type and an external type, and the fuel pump 30 may be once driven to transfer fuel during driving (when pumping) to satisfy the same conditions as a driving condition of an actual vehicle. The supply pipe (P1) is connected to the portion, the other end of the fuel pump 30 is connected to the return pipe (P2) for transferring the fuel transferred through the supply pipe (P1) back to the fuel pump (30). At this time, the supply pipe (P1) and the return pipe (P2) are interconnected to circulate the fuel therein.

Here, the return pipe (P2) is provided with a first pressure / temperature sensor 31 for measuring the pressure and temperature of the fuel transported therein and transmitting the measured data to the controller 50, the fuel pump 30 ), A variable regulator 32 is installed to lower the pressure to about 2 atmospheres before the high pressure (about 7 atmospheres) of the boosted fuel is introduced into the fuel pump, and the flow rate of the fuel transported therein is measured and measured. A flow meter 33 for transmitting the data to the controller is installed, and the return pipe P2 is connected to the fuel pump 30 through the cylinder, in which case the return pipe P2 is transferred from the fuel pump 30. A check valve 34 is further installed at the return pipe P2 in contact with the cylinder 20 to prevent the fuel from flowing back.

As such, the fuel pump 30 pressurizes the fuel to the saturated steam pressure or more and transfers the fuel to the outside through the supply pipe P1. For example, the fuel pump 30 may supply fuel at a pressure of 2 atmospheres (fuel pressure inside the cylinder) + 5 atmospheres (fuel pressure when driving the fuel pump) = about 7 to 10 atmospheres, and the variable regulator 32 Can be reduced to about 2 atmospheres.

As described above, the present invention is a high-precision sensing system capable of measuring the outlet flow rate, pressure, and temperature change of the fuel pump 30 through msec unit through the flow meter 33 and the first pressure / temperature sensor 31.

The controller 50 receives and collects data measured by the fuel pump driving device 40, the thermostat 10, and the cylinder 20, and data measured by various sensors by electric signals, and collects the collected data. Power supply (51), data acquisition device (DAQ, data acquisition, 52), and fuel pump control unit to analyze and control each device (10, 20, 40) by the user input data It consists of 53. At this time, the controller 50 is formed outside the thermostat 10.

Here, the power supply device 51 is a device for converting and supplying the power required for driving the devices 10, 20, 30, 40 to a stable power supply. (The power supply device 51 is a person skilled in the same field. If it is a device that anyone can carry out, no detailed description is given.)

In addition, the data collection device (DAQ, 52) collects the data transmitted from each device (21, 31, 33) and compares and determines the data input by the user, and each other device (10,20) (30, 40). (The data acquisition device (DAQ, 52) is a device that can be implemented by anyone skilled in the same field does not have a detailed description.)

In addition, the fuel pump control device 53 controls the fuel pump 30 according to a signal sent from the data acquisition device DAQ. At this time, the fuel pump control device 53 uses a PWM control system (PULSE WIDTH MODULATION CONTROL SYSTEM, not shown) to apply the drive current measurement and voltage change of the fuel pump 30. (The PWM control system is It is a device that can be implemented by anyone skilled in the same field, so no detailed description is given.)

The fuel pump driving device 40 is installed at one end of the thermostat 10 so as to be connected to the fuel pump 30, and the driving unit to measure the driving of the fuel pump 30 and the voltage / current change and the rotation speed. 41, the rotation detector 42, and the voltage / current measurer 43.

Here, the driver 41 is electrically connected to the fuel pump control device 53 of the controller 50 to drive the fuel pump 30 by the PWM control system of the fuel pump control device 53. To control.

In addition, the rotation sensing unit (RPM sensing 42) measures the revolution per minute (RPM) of the fuel pump 30 through the driving unit 41 to collect the data 52 of the controller 50 installed outside. ) To pass data to the.

In addition, the voltage / current measuring unit 43 measures the voltage and ampere of the fuel pump 30 and transmits data to the data collecting device 52 of the controller 50 installed outside.

As described above, the characteristic test apparatus of the fuel pump 30 described above is a variety of items that can determine the operating characteristics before and after driving a predetermined number or time while repeating the process of injecting and recovering fuel according to temperature, For example, the fuel pump 30 is driven and controlled on the controller 50. At this time, the PWM control is variable 0 ~ 20kHz. In addition, since the characteristic test apparatus of the fuel pump 30 is tested according to the temperature, the durability of the fuel pump 30 at low temperature and the durability of the fuel pump 30 at high temperature can be simultaneously tested.

In addition, the controller 50 may control the flow rate, temperature, pressure, current consumption, voltage, rotational speed (RPM), filter differential pressure, and the like and monitor the measurement factors. The flow rate, temperature, pressure, current consumption, Voltage, RPM, and differential pressure of the filter unit can be used for graphic display and data saving of performance characteristic curve.

In addition, the PWM mode operation edit and cycle repeat operation is possible on the controller 50. In addition, the flow rate, pressure, temperature, current consumption, and the like using a pressure indicator formed on the exterior of the controller 50 may be displayed graphically.

In addition, real-time calculation and graphical display of average value, COV (Coefficient Of Variation), and efficiency of performance data such as flow rate, temperature, and pressure may be performed on the controller 50.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

1 is a schematic view showing a fuel pump characteristic test apparatus according to an embodiment of the present invention.

Description of the Related Art

10: thermostat 20: bomb

21: second pressure / temperature sensor 30: fuel pump

31: first pressure / temperature sensor 32: variable type regulator

33: flow meter 34: check valve

40: fuel pump drive unit 41: drive unit

42: rotation detection unit 43: voltage / current measurement unit

50: controller 51: power supply

52: data collection device 53: fuel pump control device

Claims (9)

In the device for testing the operating characteristics of the fuel pump for each temperature according to the pressurized conditions, A thermostat 10 for selectively adjusting the temperature therein; The second pressure / temperature is installed in the thermostat 10, the fuel pump 30 is installed therein to store the fuel in a liquid state to pressurize the pressure according to the conditions, and to measure the pressure and temperature therein. A bomb (bombe) 20 in which the sensor 21 is installed at one end; A pressure supply device connected to the cylinder 20 and installed outside the thermostat 10 to pressurize a pressure suitable for a condition therein; A supply pipe P1 is connected to one end of the cylinder 20 so as to pressurize the fuel above the saturated steam pressure to pump the outside and return the fuel transported by being connected to the supply pipe P1. The pipe P2 is connected to the other end, and the return pipe P2 measures the flow rate of the first pressure / temperature sensor 31 for measuring the pressure and temperature of the fuel transported therein and the fuel transported therein. A fuel pump 30 in which a flowmeter 33 is installed; The thermostat 10 is connected to the fuel pump 30 to control the driving (on / off) of the fuel pump 30 and to measure the voltage / current change and the rotation speed of the fuel pump 30. A fuel pump driving device 40 installed at one end of the inner portion; The voltage / current change and the rotation speed of the fuel pump driving device 40, the temperature of the thermostat 10 and the pressure / temperature of the cylinder 20 are received and collected by an electrical signal, and collected. The controller 50 formed on the outside of the thermostat 10 to analyze the data and control the thermostat 10, the bomb 20, the fuel pump 30, and the fuel pump driving device 40 based on the data input by the user. Including; The fuel pump 30 is a characteristic test apparatus for a fuel pump for a vehicle, characterized in that the test can be selectively selected from the built-in and exterior. The method of claim 1, wherein the controller 50, A power supply 51 for supplying power for driving the thermostat 10, the bombe 20, the fuel pump 30, and the fuel pump driving device 40; Data collection device for collecting the data transmitted from the second pressure / temperature sensor 21, the first pressure / temperature sensor 31 and the flow meter 33 and compares the data inputted by the user and sends a signal (DAQ, data acquisition (52); A fuel pump controller 53 for controlling the fuel pump 30 according to a signal sent from the data acquisition device DAQ; Characteristic test apparatus for a vehicle fuel pump, characterized in that comprises a. According to claim 2, The fuel pump drive device 40, A driver (41) electrically connected to the fuel pump control device (53) of the controller (50) to control the driving of the fuel pump (30) by the signal of the fuel pump control device (53); Rotation sensing unit (RPM sensing) for measuring the revolution number (RPM, revolution per minute) of the fuel pump 30 through the drive unit 41 to transfer data to the data collection device 52 of the controller 50 installed outside 42);  A voltage / current measuring unit 43 measuring voltage and ampere of the fuel pump 30 and transferring data to a data collecting device 52 of an external controller; Characteristic test apparatus for a vehicle fuel pump, characterized in that comprises a. 3. The method of claim 2, Characteristic test of the fuel pump for the vehicle, characterized in that the fuel pump control device 53 uses a PWM control system (PULSE WIDTH MODULATION CONTROL SYSTEM) to apply the drive current measurement and voltage change of the fuel pump 30 Device. delete delete delete delete delete

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